<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <form action="/Homework/userOpServlet" method="post">
        用户名：<input type="text" name="username">
        密码:<input type="password" name="password">
        性别：
        男<input type="radio" name="sex" value="男" checked="checked">
        女<input type="radio" name="sex" value="女">
        生日<input type="date" name="birthday">
        <input type="submit" value="添加">
    </form>
</body>
</html>